iban-ex/lib/iban_ex/parser.ex

47 lines
1.4 KiB
Elixir

defmodule IbanEx.Parser do
@moduledoc false
alias IbanEx.{Country, Iban, Validator}
import IbanEx.Commons, only: [normalize_and_slice: 2]
@type iban_string() :: String.t()
@type country_code_string() :: <<_::16>>
@type check_digits_string() :: <<_::16>>
@type iban_or_error() :: IbanEx.Iban.t() | {:error, atom()}
@spec parse({:ok, String.t()} | String.t()) :: iban_or_error()
def parse({:ok, iban_string}), do: parse(iban_string)
def parse(iban_string) do
case Validator.validate(iban_string) do
{:ok, valid_iban} ->
iban_map = %{
country_code: country_code(valid_iban),
check_digits: check_digits(valid_iban)
}
regex = Country.country_module(iban_map.country_code).rule()
bban = bban(iban_string)
bban_map =
for {key, val} <- Regex.named_captures(regex, bban),
into: %{},
do: {String.to_atom(key), val}
{:ok, struct(Iban, Map.merge(iban_map, bban_map))}
{:error, error_type} ->
{:error, error_type}
end
end
@spec country_code(iban_string()) :: country_code_string()
def country_code(iban_string), do: normalize_and_slice(iban_string, 0..1)
@spec check_digits(binary()) :: check_digits_string()
def check_digits(iban_string), do: normalize_and_slice(iban_string, 2..3)
@spec bban(binary()) :: binary()
def bban(iban_string), do: normalize_and_slice(iban_string, 4..-1//1)
end